Amplifier



J. DIEUX AMPLIFIER Feb. 7, 1933..

Filed Jan. 51, 1928 2 Sheets-Sheet l l mmm= llllllll Feb. 7, 1933. J. DlEUx 1,896,743

AMPLIFIER Filed Jan. '51, 1928 2 Sheets-Sheet 2 Patented Feb. 7, 1933 UNITED STATES PATENT OFFICE JEAN DIEUX, OF PARIS, FRANCE AMPLIFIER I Application filed January 31, 1928, Serial No. 250,820, and in France December 14, 1927.

Electric installations are already known which comprise some source of vibrated or modulated current, such as an electric phonograph disc reproducer, a microphone,medical apparatus, va wireless telegraph apparatus and the like, the said source being com bined with an amplifier or a wireless telegraph apparatus so as to enable audition with a loud speaker of this vibrated or modulated current. The source of vibrated or modulated current is, for example, obtained with an electric reproducer consisting of a vibrating bar or armature which carries the needle resting on the disc of the phonograph, and the said bar oscillates in front of the core of an electro-inagnet and thus produces variations in the magnetic field and conseuentl variations in the current assin y is through the windings of the electro-magnet. The terminals A and B of this electromagnet are respectively connected to the grid G and a terminal of the amplifier valve.

In the known types of installations the connection of the reproducer with the valve is not satisfactory, and the results are not always good from the acoustic point of view, the valve being utilized for a purpose which was not intended and generally the valve and electric reproducer are not in harmony.

The object of this invention is to avoid such inconveniences and make the connection between the valve and source of vibrated or modulated current, such as the electric reproducer, easy and regulatable. 7

An electric installation according to the present invention consists essentially'of an auxiliary transformation boX comprising four pins and four terminals, the pins and sockets corresponding with the plate and the two terminals of the filament being elec trically connected with each other, whereas the pin and terminal corresponding with the grid can be electrically insulated one from the other and thus the transformation box can be connected to the support of an audion a terminal connected with the grid and a terminal connected with one of the filament terminals. It is thus possible to transmit the vibrations from this source without suppressing the use of the audion valve. The detector valve is not regarded as a high frequency member in the invention.

The invention also comprises a variation characterized by the members for regulating the current, the said members being placed in the circuit connecting the source of vibrated or modulated current and the audion valve thus making it possible to assure harmony between this source and the amplifier or Wireless telegraph apparatus and perfect reproduction of the vibrations from the source. V v i The invention also comprises the other essential features hereinafter described and their various combinations. p

Various installations in accordance with the invention are shown by way of example in the accompanying drawings, in which,-

Fig. 1 shows the connection of the termi- V nals of the electromagnet to the grid G and one terminal of the filament of the amplifier valve. i

Figs. 2 and 3 are, respectively, aplan view and a side view of an intermediary junction box in accordance with the invention.

Fig. 4 is a diagrammatic elevation of an amplifier or wireless telegraph panel showing the transformation box mounted on the panel. I

Fig. 5 is a plan View of a modified form of the transformation boXQ Fig 6 is a plan view of another modificationof theintermediate junction'bo'x permitting the mounting of a two-gridlamp;

Fig. 7 shows an assembly of the invention together with the control means; Fig. 8 is a diagram showing the combination of two ordinary audion valves.

In the old arrangements, such as, for instance, shown in Fig. 1, the terminals A and B of the electroma-gnet are connected to any valve of an electric amplifier or of a wireless telegraph apparatus, said valve not being included in the high frequency circuit. For example, if this valve is diagrammatically represented by the two terminals of the filament F1 F2, the grid G and the plate P, the terminals A and B can be respectively connected to the grid G and to one or the other terminal F1, F2 of the filament, and a break can be made in the grid circuit as indicated by the diagrammatic showing of Fig. 1.

The auxiliary transformation box (Figs. 2 and 3) is provided on its upper face with four terminals marked P F F and G (Fig. 3) corresponding with the plate, the two filament terminals, and the valve grid.

Four pins 6 are placed under the transformation box perpendicular to the terminals P F F 2 G. The pins and sockets corresponding with the plate and two filament terminals are electrically connected at 0 (Fig. 3) whereas the pin and terminal G corresponding to the grid can be insulated one from the other and thus produce a break in the grid circuit.

The terminals 6 b are mounted on the transformation box and serve for connection of the terminals A and B of the electric reproducer.

The device is utilized as follows: The detector valve L in the amplifier is removed and the transformation box shown in Figs. 2 and 3 is mounted in its place. The valve L is mounted on this box (Fig. 4). Thus an amplifier with one or more valves L L L is very simply made, to which the electric reproducer is connected in a simple removable way, without the use of the valve L being discontinued.

The intermediary box can evidently be mounted on one or the other valves L L L according to the required power.

Moreover it will be seen that the valve L can be readily taken away, the intermediary junction box removed and the valve L restored to its original position, the amplifier being thus returned to its original purpose.

Numerous modifications can be made in the aforesaid arrangement which has been described by way of example. In particular (Fig. 5) three terminals 6 6 6 respectively connected with the sockets F G F can be mounted on the intermediary junction box and then one of the terminals A or B of the electric reproducer can be connected, at will, either to F or F In Fig. 6 is diagrammatically shown an auxiliary transformation box comprising a socket with five terminals and permitting the mounting of five plugs of a two-grid triod lamp.

Figures 7 and 7 a illustrate an installation in accordance with a preferred embodiment of the invention.

According to the installation illustrated in Figures 7 and 7a the casing Z of an amplifier is illustrated as carrying a socket S for an audion tube T, the said tube T having as usual, a filament t, a plate 731, a grid t2, a pair of pins t3, 754 connected with the filament terminals, respectively, a pin 65 connected to the plate, and a pin 66 connected to the grid. As illustrated, the socket S is provided with four openings, two of which f1, f2, are disposed to receive the filament pins $3, 154 of the tube, another, 19, of which is disposed to receive the plate pin 55 of the tube, and the other, 9, of which is disposed to receive the grid pin t6 of the tube.

The casing of an auxiliary transformation element is designated as C and carries a socket S1 for an amplifier audion tube T1 having a filament 67, a plate 258, two grids I59, 610, respectively, a pair of pins 2511, 612 connected with the filament terminals, a pin 2513 connected to the plate, and pins file, t15 connected to the grids t9, tlO, respectively. As illustrated, the socket S1 is provided with five openings, two of which fl, f2, are disposed to receive the filament pins tll, t12, another, 22, of which is disposed to receive the plate pin 2513 of the tube, and the other two, G1, G2 of which are disposed to receive the respective grid pins tl l, 2515, respectively.

On the casing C of the auxiliary trans formation element are mounted two terminals A and B and a potentiometer comprising a resistance B2 and two cooperating slides 1m and 1m2.

It is understood, of course, that the pin receiving openings in the sockets S, S1 are constituted by tubular conductor elements to which wires are connected so that the filament, plate and grid circuits of the tubes T, T are completed by insertion of the tube pins in their corresponding openings in said sockets. Accordingly, since the pin openings in said sockets have been designated by numerals it will be understood that when reference is made to connections between said openings the connections have reference to the tubular conductor elements constituting said openings. Thus, as illustrated, the openings f1, f1 of the respective sockets corresponding to the positive poles of the filaments of the tubes are connected together by a conductor 01, the openings f2, of the respective sockets corresponding to the negative poles of the filaments of the tubes are connected together by a conductor 02, and the openings p of the respective sockets are connected together by a conductor 03. The openings G1, G2 of the sockets S1 are connected by conductors c4, 05 to the terminals B and A, respectively. The conductor 02 is connected with a conductor f2 on which the slide 1on is mounted, and the conductor 04 is connected to a conductor G'Q on which the slide 1m2 is mounted. On the other hand, the conductor 05 is connected with one end of the resistance B2.

In the operation of the device, assuming that the terminals A and B are connected to the vibrator pick-up device L of a. phonograph as illustrated in Figure 7a, the slides 1m and 10122 are suitably displaced to regulate the resistances of the different connections between the tubes in a manner which is obvious to harmonize the amplifier audion with the device L, thereby to control the valve and the volume of the sounds emitted by the apparatus. On the other hand, assuming no connection of the terminals A and B with any device such as the device L, and considering the amplifier 2 as an ordinary radio amplifier which transmits likea loud speaker the waves received by an antennae, the two-grid tube T1 functions as a detector and is regulatable by the potentiometer as in the first instance to harmonize with the received Waves.

The advantage of the use of the two-grid tube T1 is to increase the possibilities of control of the amplifier and the detector, the potentiometer in this instance obviously providing for simultaneous as well as independent regulation of the ohmic resistance of the connection of the grid 9 with the grid 610 and of the ohmic resistance of the connection of each of said grids with the filament 67.

A modified form consists in the employ ment of a combination of two ordinary audion valves, all the members of which except the grids are in parallel. All that has been said previously about the two grids of the two-grid valves applies to the two grids of this combination (Fig. 8).

In all the preceding examples electric reproducers have been given by way of example. Nevertheless, the invention comprises the devices described whatever the source of vibrated or modulated electric current.

The invention not only includes the aforesaid devices but also relates to applications of these said devices to audion valves with three, four or any number of grids or with three, four or any number of ordinary valves mounted as previously described, and thus a synchronous amplification can be obtained of several different electric sources, the said sources being of the same or of different kinds.

For example, the invention includes the application of the means described for a single transmission of two or more emissions separated in space, the amplification of a dialogue, stroboscopic inspection of motors, cinephonographic synchronism, and the like.

The invention also comprises in wireless telegraphy both emission and reception and sonorous amplification as well as luminous amplification or transmission of electric energy (simultaneous working without metallic combinator for example, or the like).

The means constituting the object of the invention are susceptible of the most varied scientific and industrial applications.

I claim:

1. In an installation for the transformation of amplifiers for changing the source of current supply, an amplifier, a socket for an audion tube, said socket having four tube pin receiving openings, a tube with a plate filament and a single grid comprising four engaged in said five pin openings of said socket, wires connecting in parallel the filament pins of saidtwo-grid tube with the filament pins of said single-grid tube, a wire connecting said plate pin of said two-grid tube with the'plate pin of said single-grid tube, and a vibrated source of current of variable amplitude connected with the grid pins of said two-grid tube.

2. In an installation for the transformation of an amplifier for changing the source of current supply, an amplifier, a socket for an audion tube, said socket having four tube pin receiving openings, an audion tube having a filament, a plate, a single-grid and four pins related to the filament, the plate and the grid respectively to be inserted in the four openings of said socket, an auxiliary transformation means comprising a socket with five pin receiving openings, a tube having a filament, a plate, two-grids and five pins related to the filament, the plate and said two grids, respectively, to be inserted in the five pin receiving openings of said socket, wires connecting in parallel the filament pins of said tubes, a wire connecting the plate pin of said two-grid tube with the plate pin of said single-grid tube, a source of vibrated current of variable amplitude connected with the grid pins of said two-grid tube, and regulating means mounted on said auxiliary transformation means for the'regulation of the vibrated. current.

3. In an installation for the transformation of an amplifier for changing the source of currentsupply, an amplifier, a socket for an audion tube, said socket having four tube pin receiving openings, an audion tube having a single-grid, a filament, a plate and four pins connected to the grid, the filament and the plate, respectively, to be inserted in the four pin receiving openings of said socket, an auxiliary transformation device comprising a socket with five pin receiving openings,

to the plate terminal of said single-grid tube,

a source of vibrated current of variable amplitude connected to the grid pins of said two-grid tube, regulating elements provided on said auxiliary device for the regulation of the vibrated current, said elements consisting in a variable resistance disposed between the two grids of said two-grid tube and one end of the filament of said tube.

4. In an installation for the transformation of an amplifier for changing the source of current supply, an amplifier, a socket for an audion tube, said socket having four tube pin receiving openings, an audion tube having a single-grid, a filament, a plate and four pins connected to the grid, the filament and the plate, respectively, to be inserted in the four pin receiving openings of said socket, an auxiliary transformation device comprising a socket with five tube pin receiving openings, a tube having two grids, a filament, a plate and five pins connected to the two grids, the filament and the plate, respectively, for insertion into the five tube pin receiving openings of said second mentioned socket, wires connecting in parallel the filament terminals of said two-grid tube with the filament terminals of said single-grid tube, a wire connecting the plate terminal of said two-grid tube with the plate terminal of said single-grid tube, a source of vibrated current of variable amplitude connected with the grid pins of said two-grid tube, regulating elements provided on said auxiliary device for the regulation and proper adaptation of said vibrated current, said elements consisting of a resistance connected with one of the grids of the said two-grid tube, a movable blade cooperating with said resistance and connected with the second grid of said twogrid tube, and a second movable blade cooperating with said resistance and connected to the filament of said two-grid tube.

In testimony whereof I afiix my signature.

JEAN DIEUX. 

